An angry aide to Rep. Ron Paul, an iPhone and $4,700 in cash have forced the Transportation Security Administration to quietly issue two new rules telling its airport screeners they can only conduct searches related to airplane safety.

In response, the American Civil Liberties Union is dropping its lawsuit on behalf of Steve Bierfeldt, the man who was detained in March and who recorded the confrontation on his iPhone as TSA and local police officers spent half an hour demanding answers as to why he was carrying the money through Lambert-St. Louis International Airport.

The new rules, issuedin September and October, tell officers “screening may not be conducted to detect evidence of crimes unrelated to transportation security” and that large amounts of cash don’t qualify as suspicious for purposes of safety.

“We had been hearing of so many reports of TSA screeners engaging in wide-ranging fishing expeditions for illegal activities,” said Ben Wizner, a staff lawyer for the ACLU, pointing to reports of officers scanning pill-bottle labels to see whether the passenger was the person who obtained the prescription as one example.